Quarterly report pursuant to Section 13 or 15(d)

Debt (Schedule of Debt) (Details)

v2.4.1.9
Debt (Schedule of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jun. 30, 2014
Nov. 30, 2014
Oct. 31, 2014
Debt Instrument [Line Items]
Total debt, gross $ 3,250,000us-gaap_DebtInstrumentCarryingAmount $ 750,000us-gaap_DebtInstrumentCarryingAmount
Unamortized discount (3,929)us-gaap_DebtInstrumentUnamortizedDiscount (2,081)us-gaap_DebtInstrumentUnamortizedDiscount
Total debt, net of discount 3,246,071us-gaap_LongTermDebt 747,919us-gaap_LongTermDebt
Current portion of long-term debt 37,500us-gaap_LongTermDebtCurrent 0us-gaap_LongTermDebtCurrent
Long-term debt 3,208,571us-gaap_LongTermDebtNoncurrent 747,919us-gaap_LongTermDebtNoncurrent
Senior Notes
Debt Instrument [Line Items]
Unamortized discount (4,000)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes | Fixed-rate 6.900% Senior notes due on May 1, 2018
Debt Instrument [Line Items]
Total debt, gross 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 750,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Effective interest rate 7.001%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Stated interest rate 6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueMay12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes | Fixed-rate 2.375% Senior notes due on November 1, 2017
Debt Instrument [Line Items]
Total debt, gross 250,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Effective interest rate 2.396%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Stated interest rate 2.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes | Fixed-rate 3.375% Senior notes due on November 1, 2019
Debt Instrument [Line Items]
Total debt, gross 250,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Effective interest rate 3.377%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Stated interest rate 3.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes | Fixed-rate 4.125% Senior notes due on November 1, 2021
Debt Instrument [Line Items]
Total debt, gross 500,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Effective interest rate 4.128%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Stated interest rate 4.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes | Fixed-rate 4.650% Senior notes due on November 1, 2024
Debt Instrument [Line Items]
Total debt, gross 1,250,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 [1] 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 [1]
Effective interest rate 4.682%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 [1]
Stated interest rate 4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 [1] 4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes | Fixed-rate 5.650% Senior notes due on November 1, 2034
Debt Instrument [Line Items]
Total debt, gross 250,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12034Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12034Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Effective interest rate 5.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12034Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Stated interest rate 5.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= klac_SeniorNotesDueNovember12034Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Term Loans
Debt Instrument [Line Items]
Total debt, gross $ 750,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember		 $ 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
[1] The effective interest rate disclosed above for this series of Senior Notes excludes the impact of the treasury rate lock hedge discussed below. The effective interest rate including the impact of the treasury rate lock hedge was 4.626%.
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